<template>
  <el-menu default-active="1-4-1"
    class="el-menu-vertical-demo" 
    @open="handleOpen" 
    @close="handleClose" 
    :collapse="collapseMenu"
    background-color="#545c64"
    text-color="#fff"
    active-text-color="#ffd04b"
    style="border:none"
    >
    <h3>后台管理系统</h3>
    <el-menu-item @click="clickMenu(item)" :index="item.path" 
      v-for="item in noChildren" :key="item.name">
      <i :class="'el-icon-' + item.icon"></i>
      <span slot="title">{{item.label}}</span>
    </el-menu-item>

    <el-submenu  :index="'item.path'" v-for="item in hasChildren" :key="item.path">
      <template slot="title">
        <i :class="'el-icon-' + item.icon"></i>
        <span slot="title">{{item.label}}</span>
      </template>
      <el-menu-item-group v-for="(subItem, subIndex) in item.children" :key="subItem.path">
        <el-menu-item @click="clickMenu(subItem)" :index="subIndex + ''">{{subItem.label}}</el-menu-item>
      </el-menu-item-group> 
    </el-submenu>

  </el-menu>
</template>

<script>
export default {
    data() {
      return {
        menu:[
          { path: '/', name: 'home', label: '首页', icon: 's-home', url: '' },
          { path: '/mall', name: 'mall', label: '商品管理', icon: 'video-play', url: 'MallManage/MallManage' },
          { path: '/user', name: 'user', label: '用户管理', icon: 'user', url: 'UserManage/UserManage' },
          { label: '其他', 
            icon: 'location', 
            children: [
              { path: '/page1', name: 'page1', label: '页面1', icon: 'setting', url: 'Other/PageOne' },
              { path: '/page2', name: 'page2', label: '页面2', icon: 'setting', url: 'Other/PageTwo' },
            ] 
          }
        ]
      };
    },
    methods: {
      handleOpen(key, keyPath) {
        console.log(key, keyPath);
      },
      handleClose(key, keyPath) {
        console.log(key, keyPath);
      },
      clickMenu(item){
        this.$router.push(item.name);
        this.$store.commit('selectMenu', item);
      },
    },
    computed:{
      noChildren(){
        return this.menu.filter(item => !item.children)
      },
      hasChildren(){
        return this.menu.filter(item => item.children)
      },
      collapseMenu(){
        return this.$store.state.tab.isCollapse
      }
    }
  }
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style lang="less" scopen>
  .el-menu{
    height: 100%;
    h3{
      text-align:center; 
      color: white;
      text-overflow: ellipsis;
      overflow: hidden;
      white-space: nowrap;
    }
  }
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
  }
</style>
